Rodriguez, who is 6 feet 4 and 200 pounds, spent last season at Double-A Reading, going 7-7 with a 4.23 ERA in 29 games (22 starts). Drafted by the Phillies in the eighth round out of the Puerto Rico Baseball Academy in 2008, Rodriguez was selected to last year’s Futures Game in Kansas City. He was also a mid-season Eastern League All Star in 2012 and a Florida State League All Star in 2011.

“He pitched in the Futures Game last year and he was also an Eastern League All Star,” said Orioles executive vice president Dan Duquette. “So he has a good arm, a good prospect. … He has all the ingredients you look for in a young pitcher. Size, arm, stuff. And he has the results, also.”

Rodriguez, who will not be placed on the 40-man, is targeted for Double-A Bowie’s rotation.

Welty, 25, was the Orioles’ 20th round pick in 2008. He batted .333 with 13 homers and 55 RBIs at four different levels in 2012. He topped out with 37 games at Bowie, where he hit .286 with eight homers. Welty was drafted by Joe Jordan, who is now the farm director for the Phillies.

“They liked Welty,” Duquette said. “Welty had a good year last year with the bat.”